If the coolant isn't seeping into the oil, perhaps try draining the coolant, and refill over again. My tech tells me the heater core is the worst to get the air out of. AND also that the only way the air will come out isn't by running the engine with the rad cap off but by the normal action of the coolant being returned back to the engine from the reservoir as the engine cools.
My son's Windstar(yeh, don't get me going) was losing coolant at a rate of a litre and a half every two weeks. I asked him all the usual q's and he said there was no white smoke from the tailpipe, no visible leaks, does not overheat, no sludge on oil filler cap or in rad.
??
He brought it up to my tech. He did a leak pressure test and found the timing cover gasket , water pump and intake gasket leaking. OK Fine. Fix it.
Get it back two days later, losing coolant again. Topped the reservoir up twice, finally stopped dropping.
NOW, the damn thing stalls during and after warmup. (Keep in mind this is a 96' 179k kms. off three year lease (like my Olds), has never had any stalling problems before).
Take it back, tech installs a new IAC valve. That worked for one day. Geezuz.
Took the van to a Ford dealer. Guy tells him the motor's shot. Typical Ford Ass***** not a G**damn clue.
Took the van to a mechanic buddy for his opinion. It'll be interesting to see who's going to find the right fix.
My tech suggested MAYBE an O2 sensor or plugged egr ports. The egr valve was replaced after the intake was replaced.
There is simply too much interconnecting (crap)components to go haywire on vehicles these days.
All to make them run cleaner, maybe, better? I don't think so.
